Diane Kruger stuns in elegant bardot gown as she wins Best Actress award at Cannes... while ex-partner Joshua Jackson congratulates her in gushing Instagram post

And now Diane Kruger has won the prestigious best actress award for her performance in the German-language drama at Cannes Film Festival.

The 40-year-old stunned in an elegant bardot gown as she collected her award on Sunday - with her ex-partner Joshua Jackson immediately taking to social media to congratulate her on the award.

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Best actress: Diane Kruger won the prestigious best actress award for her performance in In The Fade at Cannes Film Festival on Sunday

In a gushing Instagram post, Joshua, 38, wrote: 'Yes she Cannes. Having witnessed the integrity and dedication that you bring to every job, I'm over the moon to see you getting the recognition you deserve.

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Diane and Joshua announced their split in July last year after a decade together, saying they had made the decision to 'separate and remain friends'.

'I'm over the moon': Her ex-partner Joshua Jackson immediately took to social media to congratulate her on the award

Yes she Cannes: In a gushing Instagram post, Joshua praised Diane's 'integrity and dedication', adding that he was 'over the moon'

The pair - who started dating after Diane's split from her husband of five years Guillaume Canet - had been plagued by rumours of relationship problems in the months prior to a split.

Ten months on, Diane appears to have moved on from the split with Joshua, throwing herself into her work projects.

The actress exuded Hollywood glamour in a classic black gown with a bardot neckline in Cannes on Sunday.

Stunning: Diane exuded Hollywood glamour in a classic black gown with a bardot neckline in Cannes on Sunday.

Sparkling! She wrapped a statement diamond necklace around her neck

Classic look: Showing off her décolletage in the sophisticated number, she added an elegant diamond necklace to add a touch of sparkle to the look

Beauty: Wearing her tousled blonde locks parted to one side, she went for a subtle look, accentuating her lips with a rose-tinted lipstick

Sealed with a kiss! The blonde bombshell couldn't contain her excitement over the honour and joyfully kiss director Fattih Akin on the cheek

Glam gal: Diane was jaw-dropping in her bardot style look that teased her decolletage

Chic: The film beauty worked her chin-length blonde locks into a tousled wave as she made her way up the carpet

Showing off her décolletage in the sophisticated number, she added an elegant diamond necklace to add a touch of sparkle to the look.

Wearing her tousled blonde locks parted to one side, she went for a subtle look, accentuating her lips with a rose-tinted lipstick.

Diane stars as a woman whose husband and young son are killed in a bomb attack in In The Fade, a subject that is pertinent following the devastating Manchester attack on Monday.

New film: Diane, pictured with director Fatih Akin, stars as a woman whose husband and young son are killed in a bomb attack in In The Fade

Difficult subject: She has described the importance of telling 'the story of the people that get left behind' following terror attacks

Challenging: The Troy star said the role was the 'most emotional, hardest, physically challenging part' she's played

'Daily thing we live with': She described terrorism as a 'nearly daily thing that we live with' in an interview about the movie

Speaking about her part in the film, the Troy star said: 'Terrorism has become such a terrible, nearly daily thing that we live with, and what drew me to the part is that we never get to hear the story of the people that get left behind, we just hear numbers.

She added: 'It's probably the most emotional, hardest, physically challenging part I think I have ever played.'

'Just holding that grief for this entire movie, the subject matter, obviously, physically being in every scene of a film, carrying a film like this was a first for me as well.'

The actress also described how she had witnessed Islamophobic abuse first hand, saying: 'Given the times we living in, I feel there this permission of being horrible to each other, of violence, of prejudice.'

Split: Diane and Joshua announced their split in July last year after a decade together

70th Annual Cannes Film Festival: The Winners

Caméra d'Or (Best First Feature)

Jeune Femme (Montparnasse-Bienvenüe) (dir: Léonor Serraille)

Best short film

A Gentle Night (dir: Qiu Yang)

Best screenplay

The Killing of a Sacred Deer (dir: Yorgos Lanthimos); You Were Never Really Here (dir: Lynne Ramsay)